CVE-2025-66271

SYSTEM code execution via unquoted service path

Published Dec 9, 2025 · Updated Dec 9, 2025

Unquoted service path handling in ELECOM Clone for Windows before 2.36 allows local users to execute code with SYSTEM privileges. The product registers a Windows service executable path without surrounding quotation marks, allowing Windows path parsing to select an attacker-planted executable from the system-drive root. Exploitation requires write permission on that root; successful execution grants control under the service's SYSTEM account.

CVSS severity8.4
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Unquoted service path handling in ELECOM Clone for Windows before 2.36 allows local users to execute code with SYSTEM privileges. The product registers a Windows service executable path without surrounding quotation marks, allowing Windows path parsing to select an attacker-planted executable from the system-drive root. Exploitation requires write permission on that root; successful execution grants control under the service's SYSTEM account.

The record

CVE
CVE-2025-66271
Published
Dec 9, 2025
Updated
Dec 9, 2025
Vendor
ELECOM CO., LTD.
Product
Clone for Windows
Classifications
CWE-428, T1574.009
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Dec 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 9, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=prior to Ver.2.36

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

ELECOM CO., LTD. · Clone for Windowsversion=prior to Ver.2.36

Published CVSS scores

6.7JPCERT/CC and IPACVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
8.4JPCERT/CC and IPACVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-428Unquoted Search Path or Element
T1574.009Hijack Execution Flow: Path Interception by Unquoted Path

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo